<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script type="text/javascript">
			//赋值运算符有+= -= *= /=
			var num = 1;
			num += 2; //等价于 num=num+2
			console.log(num);
			其他几个赋值运算符同理
		</script>
	</head>
	<body>
	</body>
</html>
